Instrument departure, non-IFR airport

Recently I tried to depart from an non-tower airport that has no
instrument approach procedure, and hence no instrument departure. I
was told that I could not get a clearance on the ground, even with
VIFNO etc., and that I would have to depart VFR and pick my clearance
up while airborne. The recommendation made to me by both TRACON and
local FSDO for departing IFR with a low ceiling was to get a special
VFR clearance into the towered airport 6 miles away [which has an
approach and then depart IFR from there.

My question is, if I take responsibility for staying away from the
rocks [assume a low ceiling, above the tops of small hills, but below
minimum vectoring altitude], shouln't I be able to get a clearance on
the ground?

Alan, PP-AMEL-IA